Space Camera Drift Angle Control

Image motion compensation(IMC) is the key technology of high-resolution space camera. Image motion speed is seperated into two vectors in image coordinate for the existence of the Drift Angle:the forward direction image motion speed and the crosswise image motion speed.In fact,Drift Angle control eliminates the crosswise image motion speed,so it is a part of image motion compensation. Different kind space cameras use different image motion compensation methods and Drift Angle controls respectively.Applications of Drift Angle control in mechanical image motion compensation and electronic image motion compensation are introduced and analyzed in this paper.One Drift Angle control method in TDICCD tansfer space camera is emphasized. Drift Angle position closed loop control system is achieved with 80C31 as controller,step motor as transact organ and absoluteness coder as measure organ.A large number of dada are obtained in all kinds space circumstance experiments.